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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 15, 2019
Related Party Transaction [Line Items]        
Payments of Dividends $ 570 $ 553 $ 603  
Additional Paid-in Capital        
Related Party Transaction [Line Items]        
Capital contribution from The Dow Chemical Company $ 3 0 0  
The Dow Chemical Company [Member]        
Related Party Transaction [Line Items]        
Service Fee with Parent 10.00%      
Notes Receivable, Related Parties $ 1,500 1,300    
Line of Credit Facility, Maximum Borrowing Capacity 1,000      
Notes Receivable, Related Parties, Noncurrent 937 949    
Payments of Dividends 570 553    
Dividends, Paid-in-kind 71      
The Dow Chemical Company [Member] | Cost of Sales [Member] | Purchases from Dow [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party 1,100 1,600 1,700  
The Dow Chemical Company [Member] | Cost of Sales [Member] | Activity Based Costs [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party 87 85 78  
The Dow Chemical Company [Member] | General and Administrative Expense [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party 24 30 33  
The Dow Chemical Company [Member] | Estimated Federal Tax Liability, Related Party [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction 184 $ 220 $ 294  
Dow International Holdings Company [Member]        
Related Party Transaction [Line Items]        
Stock Dividend Ownership Interest Percentage, Related Company       63.40%
Dow International Holdings Company [Member] | The Dow Chemical Company [Member]        
Related Party Transaction [Line Items]        
Dividends, Common Stock, Stock $ 401